Preface xiii
material than it was possible to use, and I can only
hope that my selection has been wise, as it certainly was
careful, and that I have not overlooked or omitted any
evidence of essential importance.
For the illustrations also I am responsible. They
have been taken almost entirely from mediaeval sources,
and in many instances will be found interesting from
an artistic as well as from a technical standpoint. For
permission to reproduce them I am indebted to the
courtesy of many publishers and owners of manuscripts.
L. F. S.
Cambridge